\begin{table}

\caption{\label{tab:coding_sample_descriptives}Sample descriptives and crowd-coding statistics. Rows report values for samples 1 and 2 collected in the first and second iteration of our selective sampling strategy. Column two reports the total number of tweets distributed for coding in each round sample. Columns grouped under the header ``Crowd-coding statistics'' report the number of codings collected per tweet, the total number of codings collected the total number of coders that have contributed to coding and the per-task pay. Columns grouped under the header ``Median coding duration'' report summary statistics of the coder-level median times spent for coding a tweet.}
\centering
\fontsize{9}{11}\selectfont
\begin{tabular}[t]{rrrrrrrrrr}
\toprule
\multicolumn{2}{c}{\em{ }} & \multicolumn{4}{c}{\em{Crowd-coding statistics}} & \multicolumn{4}{c}{\em{Coder: Median coding duration}} \\
\cmidrule(l{3pt}r{3pt}){3-6} \cmidrule(l{3pt}r{3pt}){7-10}
Sample & Tweets & per tweet & Codings & Coders & Task pay & Median & Mean & SD & Skew\\
\midrule
1 & 3270 & 6 & 19620 & 329 & \$ 0.024 & 22.654 & 53.231 & 147.806 & 9.271\\
2 & 2762 & 6 & 16572 & 256 & \$ 0.048 & 19.682 & 45.732 & 109.455 & 9.433\\
\bottomrule
\end{tabular}
\end{table}
